<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            background: #333;
        }

        .map {
            width: 747px;
            height: 617px;
            background: url(./images/map.png);
            margin: 0 auto;
            position: relative;
        }

        .city {
            position: absolute;
            top: 227px;
            left: 540px;
        }

        .dott {
            width: 10px;
            height: 10px;
            background: skyblue;
            border-radius: 50%;
        }

        .city div[class^="pu"] {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 10px;
            height: 10px;
            box-shadow: 0 0 12px rgb(0, 157, 253);
            animation: move 1.2s linear infinite;
            border-radius: 50%;
        }

        .city div.pu2 {
            animation-delay: 0.4s;
        }

        .city div.pu3 {
            animation-delay: 0.8s;
        }

        @keyframes move {
            0% {}

            50% {
                width: 40px;
                height: 40px;
                opacity: 1;
            }

            100% {
                width: 70px;
                height: 70px;
                opacity: 0;
            }

        }
    </style>
</head>

<body>
    <div class="map">
        <div class="city ">
            <div class="dott"></div>
            <div class="pu1"></div>
            <div class="pu2"></div>
            <div class="pu3"></div>
        </div>

    </div>
</body>

</html>